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Is it possible to support PyArrow backed UDFs in Comet natively?

enhancementNew feature or requestNew feature or request

Status: Open.

#957 In apache/datafusion-comet;

· SemyonSinchenko opened on Sep 21, 2024

Register CometArrowAllocator as a Spark MemoryConsumer for JVM-UDF dispatch

area:expressionsExpression evaluationExpression evaluation

area:ffiArrow FFI / JNI boundaryArrow FFI / JNI boundary

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4174 In apache/datafusion-comet;

· andygrove opened on May 1, 2026

Eliminate remaining row<->Arrow round-trip in CometPythonMapInArrowExec

area:udf

enhancementNew feature or requestNew feature or request

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4240 In apache/datafusion-comet;

· andygrove opened on May 6, 2026

Re-enable COUNT for mixed Spark partial / Comet final aggregate execution

area:aggregationHash aggregates, aggregate expressionsHash aggregates, aggregate expressions

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4242 In apache/datafusion-comet;

· andygrove opened on May 6, 2026

[hdfs-opendal] Got an reader got too little data error on hdfs-opendal

area:scanParquet scan / data readingParquet scan / data reading

bugSomething isn't workingSomething isn't working

native_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan type

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#2400 In apache/datafusion-comet;

· wForget opened on Sep 16, 2025

ExecutionMemoryPool errors releasing more memory than allocated

bugSomething isn't workingSomething isn't working

priority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakage

Status: Open.

#2453 In apache/datafusion-comet;

· andygrove opened on Sep 25, 2025

Dropping a GlobalRef in a detached thread

area:ffiArrow FFI / JNI boundaryArrow FFI / JNI boundary

bugSomething isn't workingSomething isn't working

priority:highCrashes, panics, segfaults, major functional breakageCrashes, panics, segfaults, major functional breakage

Status: Open.

#2470 In apache/datafusion-comet;

· andygrove opened on Sep 26, 2025

Enable windowed aggregates and fix correctness issues

area:aggregationHash aggregates, aggregate expressionsHash aggregates, aggregate expressions

correctness

enhancementNew feature or requestNew feature or request

expressionSpark expression relatedSpark expression related

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4007 In apache/datafusion-comet;

· andygrove opened on Apr 20, 2026

[native_datafusion] Add support for reading row index metadata columns

enhancementNew feature or requestNew feature or request

native_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan type

Status: Open.

#3432 In apache/datafusion-comet;

· andygrove opened on Feb 6, 2026

Implement JVM UDFs for all date/time expressions

area:expressionsExpression evaluationExpression evaluation

enhancementNew feature or requestNew feature or request

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4311 In apache/datafusion-comet;

· andygrove opened on May 13, 2026

native_datafusion more permissive than Spark 3.x when reading Parquet TimestampNTZ columns

area:scanParquet scan / data readingParquet scan / data reading

bugSomething isn't workingSomething isn't working

native_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan type

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

spark 3.x

Status: Open.

#4219 In apache/datafusion-comet;

· andygrove opened on May 5, 2026

native_datafusion: ParquetSchemaConvert error does not include the file path

native_datafusionSpecific to native_datafusion scan typeSpecific to native_datafusion scan type

Status: Open.

#4316 In apache/datafusion-comet;

· andygrove opened on May 13, 2026

FIRST/LAST returns wrong result with PartialMerge

bugSomething isn't workingSomething isn't working

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4131 In apache/datafusion-comet;

· comphead opened on Apr 28, 2026

Establish nomenclature style guide and audit operator names for clarity

documentationImprovements or additions to documentationImprovements or additions to documentation

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4419 In apache/datafusion-comet;

· andygrove opened on May 24, 2026

Add a docs-review Claude skill to enforce style guide and documentation quality

documentationImprovements or additions to documentationImprovements or additions to documentation

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4420 In apache/datafusion-comet;

· andygrove opened on May 24, 2026

Add distinction between "info" and "fallback" messages

enhancementNew feature or requestNew feature or request

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4006 In apache/datafusion-comet;

· andygrove opened on Apr 20, 2026

Math expression audit follow-ups (from #4486)

area:expressionsExpression evaluationExpression evaluation

correctness

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#4500 In apache/datafusion-comet;

· andygrove opened on May 28, 2026

Comet 0.17.0 Release

enhancementNew feature or requestNew feature or request

priority:lowMinor issues, test failures, tooling, cosmeticMinor issues, test failures, tooling, cosmetic

Status: Open.

#4564 In apache/datafusion-comet;

· andygrove opened on Jun 2, 2026